You can cast your spells so that they occupy a larger space.
Benefit: You can alter a burst, emanation, or spread-shaped spell to increase its area. Any numeric measurements of the spell’s area increase by 100%.
Level Increase: +3 (a widened spell uses up a spell slot three levels higher than the spell’s actual level.)
Spells that do not have an area of one of these four sorts are not affected by this feat.
Pathfinder RPG Core Rulebook. Copyright 2009, Paizo Publishing, LLC; Author: Jason Bulmahn, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.